South coast mall Dischem cashier is rude

I went to Dischem this morning to get some few things, so I didn't have enough money with me I asked her that I want to return some of the this that I have bought; she was so cheeky and grumpy so to her own time to call for supervisor. Once I wa done she gave me a frozen phamflet and she didn't explain to me what to do with it, while I was packing my things she called the next person.